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<p>Reports statements that have no effect.</p>
<p><b>Example:</b></p>
<pre><code>
class Car:
    def __init__(self, speed=0):
        self.speed = speed
        self.time # has no effect

2 + 3 # has no effect
</code></pre>
<p>In this example, you can either add a field <code>time</code> to the <code>Car</code> class or
  introduce variables for the problematic statements.</p>
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